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Smart Bluetooth

4 Replies
Anonymous
Not applicable

Hi

I just check current consumption table 14, I have 2 questions:

1 Transmit current is 9.1mA , but it didn't mention RF Tx power? it's 4dBm or 0dBm?

2 Test condition is 3V power supply, We want to know test result in 1.8V or 1.62V power supply. Maybe current is lower while power voltage is 1.8V. I just want to know what's best for power consumption.

Thanks!

Edward

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MichaelF_56
Moderator
Moderator

0dBm.

The current of 9.3mA is measured between power terminals (Vdd) using 90% efficient DC-DC converter at 3V.

Note here that Ohms Law (I x E) comes into play and essentially if you drop down to 1.62V min battery voltage, current will roughly double - Power in = Power Out

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Anonymous
Not applicable

Sorry, I mean, DC2DC output voltage is 1.62V or 1.8V, not battery voltage.

Since there are 1.2V voltage domain in BCM20737, if power supply(DC2DC) is 1.8V, efficiency of internal LDO will be improved.  So total power consumption will be better than 3V DC2DC output. I guess. Especially for quiescent/sleep current.

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MichaelF_56
Moderator
Moderator

The power numbers we provide today (and discussed above) are based on currents measured between power terminals (Vdd) using 90% efficient DC-DC converter at 3V.  There is some additional work being done internally to provide additional power numbers under specific use case scenarios, but I don't have an ETA on when that will be completed.

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